Rivalries are an unspoken understanding that both teams are playing for pride.
A feud is what happens when that rivalry is no longer unspoken.
College football has had its fair share of feuds break out in the last couple of years, and has even started taking measures to prevent some of these breakouts from occurring.
When Oregon played Boise State for the college football opener in 2009 players shook hands before the start of the game.
Oregon running back LaGarrette Blunt threw punches after.
Here's a look at some of the best recent feuds in college football and a ruling on who was more in the wrong.